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1/*
2 * linux/include/asm-arm/io.h
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Modifications:
11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
12 * constant addresses and variable addresses.
13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
14 * specific IO header files.
15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
16 * 04-Apr-1999 PJB Added check_signature.
17 * 12-Dec-1999 RMK More cleanups
18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions
19 * 05-Oct-2004 BJD Moved memory string functions to use void __iomem
20 */
21#ifndef __ASM_ARM_IO_H
22#define __ASM_ARM_IO_H
23
24#ifdef __KERNEL__
25
26#include <linux/types.h>
27#include <asm/byteorder.h>
28#include <asm/memory.h>
29#include <asm/arch/hardware.h>
30
31/*
32 * ISA I/O bus memory addresses are 1:1 with the physical address.
33 */
34#define isa_virt_to_bus virt_to_phys
35#define isa_page_to_bus page_to_phys
36#define isa_bus_to_virt phys_to_virt
37
38/*
39 * Generic IO read/write. These perform native-endian accesses. Note
40 * that some architectures will want to re-define __raw_{read,write}w.
41 */
42extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen);
43extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
44extern void __raw_writesl(void __iomem *addr, const void *data, int longlen);
45
46extern void __raw_readsb(void __iomem *addr, void *data, int bytelen);
47extern void __raw_readsw(void __iomem *addr, void *data, int wordlen);
48extern void __raw_readsl(void __iomem *addr, void *data, int longlen);
49
50#define __raw_writeb(v,a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a) = (v))
51#define __raw_writew(v,a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
52#define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a) = (v))
53
54#define __raw_readb(a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a))
55#define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
56#define __raw_readl(a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a))
57
58/*
59 * Bad read/write accesses...
60 */
61extern void __readwrite_bug(const char *fn);
62
63/*
64 * Now, pick up the machine-defined IO definitions
65 */
66#include <asm/arch/io.h>
67
68#ifdef __io_pci
69#warning machine class uses buggy __io_pci
70#endif
71#if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \
72 defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl)
73#warning machine class uses old __arch_putw or __arch_getw
74#endif
75
76/*
77 * IO port access primitives
78 * -------------------------
79 *
80 * The ARM doesn't have special IO access instructions; all IO is memory
81 * mapped. Note that these are defined to perform little endian accesses
82 * only. Their primary purpose is to access PCI and ISA peripherals.
83 *
84 * Note that for a big endian machine, this implies that the following
85 * big endian mode connectivity is in place, as described by numerious
86 * ARM documents:
87 *
88 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
89 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
90 *
91 * The machine specific io.h include defines __io to translate an "IO"
92 * address to a memory address.
93 *
94 * Note that we prevent GCC re-ordering or caching values in expressions
95 * by introducing sequence points into the in*() definitions. Note that
96 * __raw_* do not guarantee this behaviour.
97 *
98 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
99 */
100#ifdef __io
101#define outb(v,p) __raw_writeb(v,__io(p))
102#define outw(v,p) __raw_writew(cpu_to_le16(v),__io(p))
103#define outl(v,p) __raw_writel(cpu_to_le32(v),__io(p))
104
105#define inb(p) ({ unsigned int __v = __raw_readb(__io(p)); __v; })
106#define inw(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
107#define inl(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
108
109#define outsb(p,d,l) __raw_writesb(__io(p),d,l)
110#define outsw(p,d,l) __raw_writesw(__io(p),d,l)
111#define outsl(p,d,l) __raw_writesl(__io(p),d,l)
112
113#define insb(p,d,l) __raw_readsb(__io(p),d,l)
114#define insw(p,d,l) __raw_readsw(__io(p),d,l)
115#define insl(p,d,l) __raw_readsl(__io(p),d,l)
116#endif
117
118#define outb_p(val,port) outb((val),(port))
119#define outw_p(val,port) outw((val),(port))
120#define outl_p(val,port) outl((val),(port))
121#define inb_p(port) inb((port))
122#define inw_p(port) inw((port))
123#define inl_p(port) inl((port))
124
125#define outsb_p(port,from,len) outsb(port,from,len)
126#define outsw_p(port,from,len) outsw(port,from,len)
127#define outsl_p(port,from,len) outsl(port,from,len)
128#define insb_p(port,to,len) insb(port,to,len)
129#define insw_p(port,to,len) insw(port,to,len)
130#define insl_p(port,to,len) insl(port,to,len)
131
132/*
133 * String version of IO memory access ops:
134 */
135extern void _memcpy_fromio(void *, void __iomem *, size_t);
136extern void _memcpy_toio(void __iomem *, const void *, size_t);
137extern void _memset_io(void __iomem *, int, size_t);
138
139#define mmiowb()
140
141/*
142 * Memory access primitives
143 * ------------------------
144 *
145 * These perform PCI memory accesses via an ioremap region. They don't
146 * take an address as such, but a cookie.
147 *
148 * Again, this are defined to perform little endian accesses. See the
149 * IO port primitives for more information.
150 */
151#ifdef __mem_pci
152#define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
153#define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
154#define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
155#define readb_relaxed(addr) readb(addr)
156#define readw_relaxed(addr) readw(addr)
157#define readl_relaxed(addr) readl(addr)
158
159#define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
160#define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
161#define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
162
163#define writeb(v,c) __raw_writeb(v,__mem_pci(c))
164#define writew(v,c) __raw_writew(cpu_to_le16(v),__mem_pci(c))
165#define writel(v,c) __raw_writel(cpu_to_le32(v),__mem_pci(c))
166
167#define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
168#define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
169#define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
170
171#define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
172#define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
173#define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
174
175#define eth_io_copy_and_sum(s,c,l,b) \
176 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
177
178static inline int
179check_signature(void __iomem *io_addr, const unsigned char *signature,
180 int length)
181{
182 int retval = 0;
183 do {
184 if (readb(io_addr) != *signature)
185 goto out;
186 io_addr++;
187 signature++;
188 length--;
189 } while (length);
190 retval = 1;
191out:
192 return retval;
193}
194
195#elif !defined(readb)
196
197#define readb(c) (__readwrite_bug("readb"),0)
198#define readw(c) (__readwrite_bug("readw"),0)
199#define readl(c) (__readwrite_bug("readl"),0)
200#define writeb(v,c) __readwrite_bug("writeb")
201#define writew(v,c) __readwrite_bug("writew")
202#define writel(v,c) __readwrite_bug("writel")
203
204#define eth_io_copy_and_sum(s,c,l,b) __readwrite_bug("eth_io_copy_and_sum")
205
206#define check_signature(io,sig,len) (0)
207
208#endif /* __mem_pci */
209
210/*
211 * If this architecture has ISA IO, then define the isa_read/isa_write
212 * macros.
213 */
214#ifdef __mem_isa
215
216#define isa_readb(addr) __raw_readb(__mem_isa(addr))
217#define isa_readw(addr) __raw_readw(__mem_isa(addr))
218#define isa_readl(addr) __raw_readl(__mem_isa(addr))
219#define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
220#define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
221#define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
222#define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
223#define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
224#define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
225
226#define isa_eth_io_copy_and_sum(a,b,c,d) \
227 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
228
229#else /* __mem_isa */
230
231#define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
232#define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
233#define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
234#define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
235#define isa_writew(val,addr) __readwrite_bug("isa_writew")
236#define isa_writel(val,addr) __readwrite_bug("isa_writel")
237#define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
238#define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
239#define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
240
241#define isa_eth_io_copy_and_sum(a,b,c,d) \
242 __readwrite_bug("isa_eth_io_copy_and_sum")
243
244#endif /* __mem_isa */
245
246/*
247 * ioremap and friends.
248 *
249 * ioremap takes a PCI memory address, as specified in
250 * Documentation/IO-mapping.txt.
251 */
252extern void __iomem * __ioremap(unsigned long, size_t, unsigned long, unsigned long);
253extern void __iounmap(void __iomem *addr);
254
255#ifndef __arch_ioremap
256#define ioremap(cookie,size) __ioremap(cookie,size,0,1)
257#define ioremap_nocache(cookie,size) __ioremap(cookie,size,0,1)
258#define ioremap_cached(cookie,size) __ioremap(cookie,size,L_PTE_CACHEABLE,1)
259#define iounmap(cookie) __iounmap(cookie)
260#else
261#define ioremap(cookie,size) __arch_ioremap((cookie),(size),0,1)
262#define ioremap_nocache(cookie,size) __arch_ioremap((cookie),(size),0,1)
263#define ioremap_cached(cookie,size) __arch_ioremap((cookie),(size),L_PTE_CACHEABLE,1)
264#define iounmap(cookie) __arch_iounmap(cookie)
265#endif
266
267/*
268 * can the hardware map this into one segment or not, given no other
269 * constraints.
270 */
271#define BIOVEC_MERGEABLE(vec1, vec2) \
272 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
273
274/*
275 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
276 * access
277 */
278#define xlate_dev_mem_ptr(p) __va(p)
279
280/*
281 * Convert a virtual cached pointer to an uncached pointer
282 */
283#define xlate_dev_kmem_ptr(p) p
284
285#endif /* __KERNEL__ */
286#endif /* __ASM_ARM_IO_H */